1//===--- DemangleConfig.h --------------------------------------*- C++ -*-===//
  2//
  3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4// See https://llvm.org/LICENSE.txt for license information.
  5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6//
  7// This file is contains a subset of macros copied from
  8// llvm/include/llvm/Demangle/DemangleConfig.h
  9//===----------------------------------------------------------------------===//
 10
 11#ifndef LIBCXXABI_DEMANGLE_DEMANGLE_CONFIG_H
 12#define LIBCXXABI_DEMANGLE_DEMANGLE_CONFIG_H
 13
 14// Must be defined before pulling in headers from libc++. Allow downstream
 15// build systems to override this value.
 16// https://libcxx.llvm.org/UsingLibcxx.html#enabling-the-safe-libc-mode
 17#ifndef _LIBCPP_VERBOSE_ABORT
 18#define _LIBCPP_VERBOSE_ABORT(...) __abort_message(__VA_ARGS__)
 19#include "../abort_message.h"
 20#endif
 21
 22#ifndef _LIBCPP_LOG_HARDENING_FAILURE
 23// Libc++abi does not have any functionality to log and continue, so we drop
 24// error messages when we build the demangler with `observe` assertion semantic.
 25// Once the layering with libc++ is improved, this could use the libc++
 26// functionality to log hardening failures.
 27#define _LIBCPP_LOG_HARDENING_FAILURE(message) ((void)0)
 28#endif
 29
 30#include <version>
 31
 32#ifdef _MSC_VER
 33// snprintf is implemented in VS 2015
 34#if _MSC_VER < 1900
 35#define snprintf _snprintf_s
 36#endif
 37#endif
 38
 39#ifndef __has_feature
 40#define __has_feature(x) 0
 41#endif
 42
 43#ifndef __has_cpp_attribute
 44#define __has_cpp_attribute(x) 0
 45#endif
 46
 47#ifndef __has_attribute
 48#define __has_attribute(x) 0
 49#endif
 50
 51#ifndef __has_builtin
 52#define __has_builtin(x) 0
 53#endif
 54
 55#ifndef DEMANGLE_GNUC_PREREQ
 56#if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
 57#define DEMANGLE_GNUC_PREREQ(maj, min, patch)                           \
 58  ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >=          \
 59   ((maj) << 20) + ((min) << 10) + (patch))
 60#elif defined(__GNUC__) && defined(__GNUC_MINOR__)
 61#define DEMANGLE_GNUC_PREREQ(maj, min, patch)                           \
 62  ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10))
 63#else
 64#define DEMANGLE_GNUC_PREREQ(maj, min, patch) 0
 65#endif
 66#endif
 67
 68#if __has_attribute(used) || DEMANGLE_GNUC_PREREQ(3, 1, 0)
 69#define DEMANGLE_ATTRIBUTE_USED __attribute__((__used__))
 70#else
 71#define DEMANGLE_ATTRIBUTE_USED
 72#endif
 73
 74#if __has_builtin(__builtin_unreachable) || DEMANGLE_GNUC_PREREQ(4, 5, 0)
 75#define DEMANGLE_UNREACHABLE __builtin_unreachable()
 76#elif defined(_MSC_VER)
 77#define DEMANGLE_UNREACHABLE __assume(false)
 78#else
 79#define DEMANGLE_UNREACHABLE
 80#endif
 81
 82#if __has_attribute(noinline) || DEMANGLE_GNUC_PREREQ(3, 4, 0)
 83#define DEMANGLE_ATTRIBUTE_NOINLINE __attribute__((noinline))
 84#elif defined(_MSC_VER)
 85#define DEMANGLE_ATTRIBUTE_NOINLINE __declspec(noinline)
 86#else
 87#define DEMANGLE_ATTRIBUTE_NOINLINE
 88#endif
 89
 90#if !defined(NDEBUG)
 91#define DEMANGLE_DUMP_METHOD DEMANGLE_ATTRIBUTE_NOINLINE DEMANGLE_ATTRIBUTE_USED
 92#else
 93#define DEMANGLE_DUMP_METHOD DEMANGLE_ATTRIBUTE_NOINLINE
 94#endif
 95
 96#if __cplusplus > 201402L && __has_cpp_attribute(fallthrough)
 97#define DEMANGLE_FALLTHROUGH [[fallthrough]]
 98#elif __has_cpp_attribute(gnu::fallthrough)
 99#define DEMANGLE_FALLTHROUGH [[gnu::fallthrough]]
100#elif !__cplusplus
101// Workaround for llvm.org/PR23435, since clang 3.6 and below emit a spurious
102// error when __has_cpp_attribute is given a scoped attribute in C mode.
103#define DEMANGLE_FALLTHROUGH
104#elif __has_cpp_attribute(clang::fallthrough)
105#define DEMANGLE_FALLTHROUGH [[clang::fallthrough]]
106#else
107#define DEMANGLE_FALLTHROUGH
108#endif
109
110#ifndef DEMANGLE_ASSERT
111#include <cassert>
112#define DEMANGLE_ASSERT(__expr, __msg) assert((__expr) && (__msg))
113#endif
114
115#define DEMANGLE_NAMESPACE_BEGIN namespace { namespace itanium_demangle {
116#define DEMANGLE_NAMESPACE_END } }
117
118#endif // LIBCXXABI_DEMANGLE_DEMANGLE_CONFIG_H